Table of Contents
Advertisement
Connecting the Equipment Power Supply
Shut down the power supply to the cabinet before measuring resistance between the power input
terminals of the DC PDU. If you measure the resistance with power on, personal injuries may result.
Measure the resistance between the input terminals of the power box. Use a multimeter to measure the
resistance between the input terminals of the power box. The measured resistance should be greater than
20 kohms. Also measure the resistance between the positive and negative output terminals. The
measured resistance should be infinitely great, which indicates that the output terminals are not short-
circuited.
Check the fuse current of the external power supply.
The working current of the fuse on the power distribution cabinet may be affected by certain factors such as
temperature. Hence, derating should be adopted during design of power distribution.
Principle for selecting a fuse: rated working current of fuse ≥ 1.25 x maximum working current of equipment.
Max. Power Consumption
2400 W
It is recommended that one circuit breaker (fuse) in the power distribution cabinet corresponds to one set of
equipment (subrack). That is, one circuit breaker in the power distribution cabinet outputs one channel of power
supply, which is provided to only one set of equipment instead of multiple sets of equipment. If one circuit breaker
in the power distribution cabinet corresponds to multiple sets of equipment, when overcurrent occurs on one set
of equipment, the circuit breaker may perform the protection operation. Hence, the power of multiple sets of
equipment fails.
Test the voltage between NEG(-) and RTN(+) on the DC power box. When - 48 V power supply is
connected, the voltage should range from - 38.4 V to - 57.6 V. When - 60 V power supply is connected, the
voltage should range from - 48 V to - 72 V.
Connect the power supply for the subrack.
Wait for a moment until the boards begin to operate. Observe the cabinet indicator and the fan indicator. In
normal conditions, the cabinet indicator should be on (green) and the fan indicator should be in the state as
shown in the following figure.
The two power inputs of the PIU correspond to the two FAN boards in the upper and lower frames respectively.
When powering on the equipment, check whether the FAN boards work normally according to this mapping
relation.
Max. Working Current
58 A
27
Fan indicator
Advertisement
Table of Contents
